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%I #6 Oct 02 2022 00:53:55
%S 57,145,177,1649,7073,23401,131361,423393,2012174,4785713,33555057,
%T 43050817,177264449,364568617,1073792449,4486784401,13877119009,
%U 31381070257,94143190994,125937424601,2552470327702,8796093024057,33233199005057,130291290501553,1628414210130481,1853020188884609
%N Leyland numbers which are products of two distinct primes.
%C A squarefree subsequence of Leyland numbers (which are numbers that can be written as a^b + b^a for a, b > 1).
%e 57 = 3*19 = 5^2 + 2^5.
%e 2012174 = 2*1006087 = 9^5 + 5^9.
%e 4486784401 = 11*407889491 = 10^9 + 9^10.
%e 2552470327702 = 2*1276235163851 = 13^9 + 9^13.
%Y Intersection of A076980 and A006881.
%K nonn
%O 1,1
%A _Massimo Kofler_, Aug 07 2022
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